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Alibaba Cloud DNS:Limits

Last Updated:Nov 28, 2023

Limits on the built-in authoritative module

Item

Limit

Description

Maximum number of zones

500

Up to 500 zones can be added within each Alibaba Cloud account.

Maximum number of associated VPCs

100

Up to 100 virtual private clouds (VPCs) can be associated with a zone.

Maximum number of Alibaba Cloud accounts whose VPCs can be associated with a zone

200

VPCs of up to 200 Alibaba Cloud accounts can be associated with a zone.

Maximum number of DNS records

100,000 (regular zone)

Up to 100,000 Domain Name System (DNS) records can be added for a built-in authoritative acceleration zone or a built-in authoritative regular zone by default. If you want to add more DNS records, submit a ticket to increase the limit.

100,000 (acceleration zone)

Weight setting

Not supported (regular zone)

If you configure multiple IP addresses for a hostname, after a DNS request for the hostname is sent, the IP addresses are returned based on weight settings to achieve load balancing.

Supported (acceleration zone)

Intranet DNS resolution based on custom lines

Not supported (regular zone)

You can customize specific IP addresses for the DNS requests that are sent from a specific internal CIDR block in the built-in authoritative DNS.

Supported (acceleration zone)

Maximum number of DNS requests that an ECS instance in a VPC can send per second

5,000

Up to 5,000 DNS requests can be sent by an Elastic Compute Service (ECS) instance in a VPC per second. If the upper limit is exceeded, throttling may be triggered and service availability of 99.99% in the Service Level Agreement (SLA) may not be guaranteed.

Maximum number of DNS requests that all ECS instances in a VPC can send per second

Unlimited

The total number of DNS requests that all ECS instances in a VPC can send per second is not limited.

Maximum number of recursive DNS requests from an ECS instance in a VPC that can be sent to the Internet per second

600

An ECS instance in a VPC can send up to 600 recursive DNS requests to the Internet per second. If the upper limit is exceeded, throttling may be triggered.

Maximum number of recursive DNS requests from all ECS instance in a VPC that can be sent to the Internet

5,000

All ECS instances in a VPC can send up to 5,000 recursive DNS requests to the Internet per second. If the upper limit is exceeded, throttling may be triggered.

Wildcard intranet DNS resolution

-

Wildcard intranet DNS resolution is supported only when the recursive resolution proxy for subdomain names is disabled.

Limits on the format of a zone

  • A zone can be up to 200 characters in length and have at least the first-level set.

    Note

    The levels are separated with periods (.). For example, a represents the first-level set, a.b represents the second-level set, and a.b.c represents the third-level set.

  • The first-level set of a zone, also known as the top-level zone, can be 2 to 63 characters in length. The other zones below the top-level zone can be 1 to 63 characters in length.

    Note

    Take the zone www.aliyun.com as an example. com can be 2 to 63 characters in length, aliyun can be 1 to 63 characters in length, and www can be 1 to 63 characters in length.

  • A reverse lookup zone ends with .in-addr.arpa

Limits on the forward module

Item

Limit

Description

Maximum number of endpoints within an Alibaba Cloud account

20

Up to 20 endpoints can be created within an Alibaba Cloud account.

Maximum number of forwarding rules within an Alibaba Cloud account

1000

Up to 1,000 forwarding rules can be created within an Alibaba Cloud account.

Number of IP addresses for an outbound endpoint

2 to 6

Two to six outbound endpoints can be created within an Alibaba Cloud account.

Maximum number of destination IP addresses that can be specified in a forwarding rule

6

Up to six destination IP addresses can be specified in a forwarding rule.

Maximum number of VPCs that can be specified in a forwarding rule

100

Up to 100 VPCs can be specified in a forwarding rule.

Maximum number of subzone levels for a forward zone

5

Up to five levels of subzones can be added for a forward zone. For example, the subzone named a.b.c.d.e is supported. However, the subzone named a.b.c.d.e is not supported. If you enter an invalid subzone name, an error message will appear.